With the further development of China's reform and opening up, buildings are getting higher and higher. In these high-rise buildings, most of the windows are floor to floor windows to increase the indoor lighting. However, because these glasses generally do not have the function of adjusting the light, if the residents want to adjust the light, they usually install a group of curtains on the windows, and adjust the opening and closing of the windows to adjust the light. However, by installing curtains to adjust the light, not only the process increases and increases the cost, but also the users need to manually adjust the opening and closing of windows, which is not convenient.

Nano violet tungsten oxide has optical properties and strong absorption ability in near infrared region. Therefore, it can be used as a photothermal conversion material and used in cancer treatment. Nano violet tungsten oxide has a very high application value in the preparation of near infrared photothermal medicine.

Under an atmosphere of H₂ or Ar, WS₂ nanotube with small diameter and few layers can be successfully synthesized by heating W₁₈O₄₉ nanowire and sulfur powders at 840°C. During the preparation process, W₁₈O₄₉ nanowire is first prepared from WCl₆ and ethanol.

W₁₈O₄₉ is a kind of supercapacitor electrode material with good electrochemical performance and huge market potential. Using W₁₈O₄₉ as electrode material can effectively improve the performance of the supercapacitor and give the device a new intelligence feature.

W₁₈O₄₉ is a kind of non-stoichiometric tungsten oxide (WO_3-x). At present, the researches on the preparation of W₁₈O₄₉ at home and abroad mostly focus on the preparation methods of W₁₈O₄₉ nanowires and nanorods. W₁₈O₄₉ nanorod can be successfully prepared by sputtering method.

As an oxide of tungsten, W₁₈O₄₉ not only has fine visible light transmittance, but good near-infrared shielding ability. Therefore, it can be used to prepare heat insulation film for building window and automobile window.

W₁₈O₄₉/PDMS coated insulating glass can be widely used in the future. It not only has fine visible light transmission, but good near-infrared shielding ability. This kind of glass can modulate the solar energy intake effectively, so as to save energy to the greatest extent.

As glass coating of W₁₈O₄₉ can guarantee high visible light transmissivity and good thermal insulating property of the glass at the same time, it has high application value in architectural windows. This kind of glass coating can effectively control the energy exchange through the window.

With good light absorbing ability and thermal insulation performance, near infrared shielding material of W₁₈O₄₉ is widely used in the windows of modern buildings and automobiles. Its application is of great importance to energy saving and environmental protection.